Photoproduction of quarkonium in proton-proton and nucleus-nucleus collisions

We discuss the photoproduction of Y and J/psi at high energy (p) over barp, pp, and heavy ion colliders. We predict large rates in (p) over barp interactions at the Fermilab Tevatron and in pp and heavy ion interactions at the CERN Large Hadron Collider. The J/psi is also produced copiously at the Relativistic Heavy Ion Collider. These reactions can be used to study the gluon distribution in protons and heavy nuclei. We also show that the different CP symmetries of the initial states lead to large differences in the transverse momentum spectra of mesons produced in (p) over barp vs pp collisions.